| Performing first fuel filling operation after installing high-pressure pump |
| Special tools and workshop equipment required |
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| Vehicle diagnostic tester |
Caution | Running when dry causes irreparable damage to high-pressure pump. |
| The high-pressure pump must first be filled with fuel before the engine is started. The high-pressure pump must not be allowed to run while still empty. |
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| When installing the high-pressure fuel pump, it is essential to ensure that no dirt enters the fuel system. |
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| Only remove sealing plugs immediately prior to installation of fuel lines. |
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| There must be sufficient fuel in the tank. |
| Proceed as follows to fill high-pressure pump with fuel. |
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| Select „Engine electronics“ in vehicle self-diagnosis. |
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| Then select „Basic setting“. |
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| Select „Checking fuel system pressurisation pump“ from the list. |
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| The fuel pumps start running. |
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| The fuel pumps must run for approx. 1 minute to ensure that the high-pressure pump is filled with sufficient fuel. |
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| Start engine after filling fuel system. |
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| Run engine at moderate speed for several minutes and then switch off. |
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| Check fuel system for leaks. |
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| After completing the repair, road-test the vehicle. Accelerate with full throttle at least once. Then check the high-pressure section of the fuel system again for leaks. |
Note | If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the event memory. Then continue the road test. |
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| Interrogate event memory. |
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